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大
山,岩,溶
洞
gen.
cavern
大 洞
:
43 phrases
in 19 subjects
Air defense
1
Architecture
2
Aviation
1
Bridge construction
2
Construction
1
Dentistry
1
Drilling
4
Earth sciences
1
Ecology
2
Engineering geology
3
Environment
1
Golf
1
Hydroelectric power stations
1
Metallurgy
2
Oil / petroleum
3
Outdoor activities and extreme sports
1
Space
4
Technology
11
Wind Energy
1
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